Add edit-in-place comments and diff-hash skip for CI#4
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When running in CI (GitLab CI / GitHub Actions), hodor now: - Updates the existing review comment instead of creating a new one - Computes a SHA-256 hash of the diff and embeds it in the comment footer - Skips the review entirely if the diff hasn't changed since the last review This eliminates stale comment trails after force pushes and avoids wasted LLM costs on unchanged diffs. GitHub comments switch from review comments (gh pr review) to issue comments (gh api) to enable editing. Adds --skip-if-unchanged/--no-skip-if-unchanged CLI flag (default: on). Also instructs the review template to omit empty issue categories when no bugs are found.
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Summary
<!-- hodor:diff-hash:sha256:... -->. If the hash matches on the next run, the review is skipped entirely ($0 cost)gh pr review --comment(review comments) togh apiissue comments, which support editing via API--skip-if-unchanged/--no-skip-if-unchanged(default: enabled when--postis used)Test plan
_compute_diff_hash()(4 tests: with SHA, fallback to branch, failure, consistency)_extract_diff_hash()(3 tests: present, missing, empty)hodor <url> --poston a GitLab MR, verify comment created with diff hash in footer